One of the Islamic State suicide bombers that carried out a deadly terror attack in Brussels on March 22 had previously worked as a janitor in the European Parliament, a spokesman for the EU assembly said, according to Reuters.

The three attacks, which occurred in the city’s Maalbeek metro station and in the airport in Zaventem, killed 35 people, including three suspected suicide bombers. Islamic State claimed responsibility for the attacks.

Laachraoui reportedly had a clean criminal record when he applied for the temporary job in the parliament, the spokesman noted.

Explaining why people like Laachraoui manage to slip through the screening process and get hired at places like the EU Parliament, Lode Vanoost, former deputy speaker of the Belgian Parliament, explained in an interview with RT that the badly-paid, temporary jobs go to people from migrant communities. Employee turnover is very high and the vetting procedure, which Vanoost described as “outdated,” simply can’t follow the personnel flow.

“It’s a total mess,” he concluded, adding that this is “not typically Belgian,” alluding to the fact that French security had also failed to flag the terrorists that committed the Paris attacks in November beforehand.

“Isn’t that ironic that we put so much emphasis on security in our society, but the people who actually have to do it [such as security guards] are mainly people who are badly paid, who hardly get a decent salary, decent working conditions. And after that you are surprised?” Vanoost asked, while noting, however, that Laachraoui had not necessarily posed a threat to security back in 2009 and 2010.

Three of the four attackers have already been identified as the brothers Ibrahim and Khalid el-Bakraoui, born in Brussels, and Laachraoui, a Belgian citizen. The fourth attacker is still being searched for by police.